Traveling abroad of backpacker is usually classified as complicated and time consuming in common for gathering data in advance. Therefore backpacker develops searching companies through the internet to alleviate possible inconveniences and risk on safety and financial loss during the journey. The study mainly discusses the mediated effect of personal social network for those who successfully solicit traveling companies. The whole structure of decision processes among the backpacker’s psychology status, the personal social network, trust and attitude will discuss in details.